getNumberAttribute() returns number instead of reference

[ansgarm]

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cdktf & Language Versions

0.3.0

Affected Resource(s)

import { DatabaseCluster } from "./.gen/providers/digitalocean";
(generated from "digitalocean/digitalocean@~> 2.8.0")

Debug Output

Expected Behavior

db.port should synthesize to Terraform reference instead of number:

"output": {
    "database_host_port": {
      "value": "${digitalocean_database_cluster.db.host}:${digitalocean_database_cluster.db.port}"
    }
}

This workaround can achieve the above:

new TerraformOutput(this, 'database_host_port', { value: `${db.host}:${db.getStringAttribute('port')}` });

Actual Behavior

new TerraformOutput(this, 'database_host_port', { value: `${db.host}:${db.port}` });

synthesizes to

"output": {
    "database_host_port": {
      "value": "${digitalocean_database_cluster.db.host}:-1.8881545897087498e+289"
    },
}

Steps to Reproduce

The above code originates from my CDK Day talk example.

Important Factoids

References

• https://github.com/ansgarm/talk-cdkday-2021/blob/master/stack-digital-ocean.ts#L36

[jsteinich]

getNumberAttribute does correctly return a token; that token just isn't resolved correctly. I hadn't observed this exact case before, but this falls under #525.

[STollenaar]

I can confirm this is also happening in 0.2.2,
I'm using my own custom provider to do some math and I noticed that only the getNumberAttribute suffers from this not resolving correctly, and always synthesizing to this negative float.
Happens with both Data and Resource source types, and not sure if there is a work around for me if I wanted to pass those references around and do some more with it

[ansgarm]

Hey @STollenaar
When I encountered the issue I used this workaround: db.getStringAttribute('port') which resolved to the correct reference (it seemed to not have mattered that the type was a number).
Does that workaround work for you?

[STollenaar]

@ansgarm not really, I unfortunately need a number as the output, but whenever you try to cast it to a number it will just go to that negative float.
I was able to get a work around by just copy the bare minimum of my custom provider code into javascript/typescript. This should work until this issue gets resolved

[ansgarm]

Ah, I see. How did you try to cast it? In TS/JS or with the tonumber Terraform function? I suspect using the latter could work, but I haven't tried.

[STollenaar]

I tried it with the TS/JS casting. Wasn't sure how to use the Terraform function for this, which in theory could work if we get that reference from the getStringAttribute

[jsteinich]

@STollenaar what are you trying to do with the number? Assign to a different property of type number? Assign to a string property? Do operations based on the number value?